The first military unit garrisoned at Yambol was the Fourth Cavalry Regiment. Then the Twenty ninth Infantry regiment of Yambol was also garrisoned. In nineteen forty four the Third pioneer unit was formed in the city.

The establishment of the Twenty ninth Infantry Regiment began in eighteen ninety nine when reserve regiments had been established in the Bulgarian army. One of them, the Fifth Regiment was to be established in Yambol. In nineteen and three it was reorganized in an acting regiment and renamed as the Twenty ninth Infantry Regiment of Yambol. In nineteen twelve the Russian graduate Colonel Krastio Zlatarev was appointed as a commander of the regiment. For his bravery during the battles at Ileritabie and Cahatldzha, he was awarded a Military Cross Third degree. The personnel of the regiment were recruited from Yambol and from the villages in Yambol and Elhovo regions.

So, on fifth of October, nineteen twelve the Balkan war began. From the very beginning of the hostilities the Twenty ninth Regiment of Yambol attacked the Ottoman positions at Muratchaldge village and inflicted heavy damages to the Turks who started retreating towards Edirne.  At the same time the Fourth Cavalry regiment fought against the Ottoman troops at Seliolu, Koyun Gyaur Kavakli and organized an attack at Seidler station and Karisstran.

This brings us to the twentieth of November, nineteen twelve, when the allies signed an armistice with the Ottoman Empire which was soon afterwards violated by the government of the Young Turks Party and the military activities were resumed.

On twelfth of March, the Twenty ninth Infantry regiment of Yambol got an order to attack the Edirne fortress. The regiment seized the heights Eski Kumluk – Pachadzhilar.  The success of Yambol soldiers gave chance to the artillery to start fire to Edirne forts.

On thirteenth of March Yambol soldiers attacked fort Ylduztabia where they had to help the Thirty second Infantry regiment of Zagora. The commander of fort Ylduztabia did not wait the attack to begin and raised the white flag. Then Topyolu and Kaiktabia fell, the latter being the last fort before Edirne. After nearly eight hours of assault all strongholds were conquered and until noon on the thirteenth of March the Bulgarian army seized Edirne. With their courage soldiers of Yambol won the honor to be the first military unit that set foot on the inaccessible fortress of Edirne.

During the subsequent Inter-allies war the regiments of Yambol won their fame again.  The Twenty ninth Infantry regiment of Yambol, together with the Thirty second regiment of Zagora got an order to take positions south of Kukush. They were defending the entrance of Rupel Gorge and also the right bank of Kresna Gorge. During a fierce fighting on Vidren Mount, Yambolers did not let the Greeks to transfer some of their military units near Pehchevo town, which on its part facilitated our Sixth division to surround their troops.
At the same time the Fourth Cavalry regiment guarded Midia – Enos line and protected by fighting the withdrawal of Forty seventh and Forty eighth Infantry regiments.

The signing of Bucharest Peace Treaty on the twenty eighth of July nineteen thirteen led to the demobilization of the regiment of Yambol. The war casualties were more than one third of the regiment soldiers – about one thousand six hundred men.

During War World One the Twenty ninth Infantry regiment of Yambol joined the war at Kiustendil and Gorna Djumaya. Together with the Thirty second Infantry regiment of Zagora, it advanced along the left bank of Morava River, so that to come behind the enemy lines. On sixteenth of November nineteen fifteen the soldiers of Yambol captured the coach of the Serbian king Petar.

In that time, the Fourth Cavalry regiment was at the Macedonian front. It fought at Tsarevo village, Kochani and Prilep. In the summer of nineteen sixteen it was transferred to the front of Dobrudzha. Then it guarded the section on the Danube from Tulcha to the mouth of Sveti Georgi tributary.

After the military actions in Kosovo, the Twenty ninth Infantry regiment of Yambol was deployed in the location Dobro Pole where the allies’ forces concentrated their main blow. Their break-through led to the truce of Thessaloniki between Kingdom Bulgaria and the Entente. Later on, after signing of the Treaty of Neuilly, the Twenty ninth Infantry regiment of Yambol was disbanded.

In nineteen twenty eight the Regiment was raised again within the staff of the Thirty seventh Infantry Pirinska and Twelfth Gendarme division